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when toggle format what by license comment
May 2, 2017 at 8:47 comment added Lucas K. Thanks for the answer, you are absolutely right, but it was not what I intended. I have edited the question. I mean $L + \phi \vdash \psi$. I think this will do.
May 1, 2017 at 21:44 history answered Andreas Blass CC BY-SA 3.0